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  • Elsevier  (37)
  • Springer  (27)
  • American Institute of Physics  (1)
  • 2020-2021
  • 1980-1984  (65)
  • 1
    Electronic Resource
    Electronic Resource
    Ternary systems of two interacting copolymers and a solvent (1983)
    Springer
    Polymer bulletin 9 (1983), S. 313-320 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Closed loop diagrams were obtained with ternary systems containing two interacting copolymers (styrene-4-vinylpyridine / styrene-methacrylic acid or methyl methacrylate-4-vinylpyridine / methyl methacrylate-methacrylic acid) and a solvent (dioxane or chloroform). Viscosimetric interaction parameters were determined in both solvents. Higher interactions in chloroform than in dioxane were evidenced from greater positive Δ b23. A single glass transition temperature obtained with the pair of copolymers of styrene-methacrylic acid / butyl methacrylate-4-vinylpyridine confirmed the compatibility of these copolymers in the solid state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262724
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  • 2
    Electronic Resource
    Electronic Resource
    Association between acidic and basic copolymers by low angle laser light scattering photometry (1982)
    Springer
    Polymer bulletin 7 (1982), S. 607-614 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Measurements of both apparent molecular weight and second virial coefficient of solutions of styrene-4-vinylpyridine copolymer in ethyl benzoate containing varying concentrations of methyl methacrylate-methacrylic acid copolymer isorefractive with ethyl benzoate were carried out by low angle laser light scattering. The apparent molecular weight depended very little on the acidic copolymer concentration. The second virial coefficient first decreased rapidly, then increased and finally tends to level off as the acidic copolymer concentration was raised. Great association is observed when the visible polymer is in excess.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256094
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions with heterocyclic amidines, VII: Synthesis of some new pyrazolo[1,5-c]-1,2,4-triazines, pyrazolo[1,5-a]-1,3,5-triazines and pyrazolo[1,5-a]pyrimidines (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 245-252 
    Details
    ISSN: 1434-4475
    Keywords: Cyanoethylation ; Heterocyclic compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Diazotiertes 5-Amino-3-methyl-4-phenylpyrazol (1) reagiert mit einer aktiven Methylenkomponente und β-Naphthol zu den Pyrazolo[1,5-c]-1,2,4-triazin-Derivaten2a-e und5. 1 ergibt mit Benzoylisothiocyanat und Phenylisothiocyanat die entsprechenden Pyrazol-5-yl-thioharnstoffe6a, b. 5a wurde mittels Säure oder Base in das Thioharnstoffderivat8 umgewandelt. Es wird über eine Synthese von 2-Methyl-3-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-on aus α-Phenylacetoacetonitril (3-Oxo-2-phenyl-butyronitril) und β-Cyanoethylhydrazin berichtet.
    Notes: Abstract Diazotised 5-amino-3-methyl-4-phenyloyrazole (1) reacted with active methylene reagents and with β-naphthol to yield the pyrazolo[1,5-c)-1,2,4-triazine derivatives2a-e and5. Compound1 reacted with benzoyl isothiocyanate and with phenyl isothiocyanate to yield the corresponding pyrazol-5-ylthiourea derivatives6a, b. 5a was converted into the thiourea derivative8 by the action of acids or alkalies. A synthesis of 2-methyl-3-phenyl-4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidin-5-one from the reaction of α-phenylacetoactonitrile (3-oxo-2-phenyl-butyric nitrile) and β-cyanoethylhydrazine is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00911090
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  • 4
    Electronic Resource
    Electronic Resource
    On the Burnside problem for periodic groups (1983)
    Springer
    Mathematische Zeitschrift 182 (1983), S. 385-388 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179757
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on 5-aminopyrazole derivatives synthesis of some new fused pyrazole derivatives (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 431-436 
    Details
    ISSN: 1434-4475
    Keywords: Enaminonitriles ; Fused Pyrazoles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von 5-Amino-4-cyano-3-phenylpyrazol (1) mit Acrylnitril oder Ethylacrylate ergibt 4-Cyano-3-phenyl-4,5,6,7-tetrahydro-5-oxopyrazolo-[1,5-a]-pyrimidin (2). Die Reaktion von1 mit Harnstoff, Thioharnstoff und7. Ethyl acetoacetat ergibt die Pyrazolopyrimidinderivate6a,6b und7. Andererseits entsteht das Thioharnstoffderivat4 durch die Reaktion von1 mit Benzoylisothiocyanat. Diazotiertes1 koppelt mit Malononitril und Ethylcyanoacetat zu den Pyrazolopyrimidinen10 und11, die Kopplung mit α-chloroacetoacetic ester und Acetylaceton ergibt jedoch die Hydrazone12 und13.
    Notes: Abstract 5-Amino-4-cyano-3-phenylpyrazole (1) reacts with acrylonitrile or ethyl acrylate to yield 4-cyano-3-phenyl-4,5,6,7-tetrahydro-5-oxopyrazolo-[1,5-a]-pyrimidine (2). With urea, thiourea and ethyl acetoacetate1 gives the pyrazolopyrimidine derivatives6a,6b, and7 respectively. On the other hand, compound1 reacted with benzoylisothiocyanate to give the corresponding thiourea derivative4. Diazotized1 was coupled with malononitrile and ethyl cyanoacetate to yield the pyrazolopyrimidine derivatives10 and11, respectively, whereas on coupling with α-chloro acetoacetic ester and with acetylacetone the hydrazones12 and13 were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810004
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  • 6
    Electronic Resource
    Electronic Resource
    A note on subnormality in factorizable finite groups (1984)
    Springer
    Archiv der Mathematik 42 (1984), S. 97-101 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01772926
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  • 7
    Electronic Resource
    Electronic Resource
    Detection of carriers for duchenne muscular dystrophy. Quality control of creatine kinase assay (1982)
    Springer
    Human genetics 〈Berlin〉 61 (1982), S. 205-209 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A report by Bullock and coworkers has emphasized the need for standardization of the CK assay in carrier detection for DMD. A collaborative study, according to a well-specified design and involving two laboratories in Paris and Lyon, indicates that the reliability of this assay can be improved provided that special attention is paid to information about participating subjects, laboratory protocol, and repeated sampling. On a random sample of young women, mean and variance of 1n(CK) are 1.66 and 0.015 respectively. Within and between variance components are in a 3:4 ratio, homogeneous between populations. Additional use of a common test serum should insure good reliability of this assay among laboratories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296443
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on extraction of iron(III) and cobalt(II) chlorides by quaternary ammonium halides (1984)
    Springer
    Transition metal chemistry 9 (1984), S. 199-202 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The extraction of iron(III) and cobalt(II) from hydrochloric acid solutions by Hyamine 1622, a quaternary ammonium halide, in dichloroethane is described. The effect of acidity, salting-out agent, metal and extradant concentrations and temperature, has been investigated. The extraction mechanism is discussed in the light of results obtained. Separation of iron(III) and cobalt(II) is also outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618617
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  • 9
    Electronic Resource
    Electronic Resource
    Regional specialization of the sperm membrane in the tick Amblyomma hebraeum koch (Acari: Ixodidae) (1980)
    Springer
    Cell & tissue research 208 (1980), S. 35-45 
    Details
    ISSN: 1432-0878
    Keywords: Tick spermatozoa ; Membrane specialization ; Sperm motility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The spermatozoon of Amblyomma hebraeum is about 200 μm long and comprises: (1) a thick, club-shaped anterior part, about 20 μm long bearing at its apex a “tactile” hemisphere, and (2) an elongated tail-like part, about 180 μm long. The surface of the “tactile” hemisphere is covered by numerous bulbous expansions, attached to it by short stalks. The base of the hemisphere is surrounded by a fringe of thin motile processes; the remaining surface of the spermatozoon is covered with long cellular processes which run more or less parallel to one another. The membrane-associated particles found on the membrane beneath the cellular processes are regularly arranged as groups of parallel strands. The external surface of the so-called “peripheral granules”, as revealed by freeze-etching, is smooth with a very small number of particles. Internally the particles exhibit a regular hexagonal pattern which has not been observed, so far, on any other membrane of these sperm cells. The regional specialization of the spermatozoon surface membrane in relation to sperm motility is discussed. The results obtained indicate that processes of three types: (1) bulbous expansions, (2) motile processes, and (3) cellular processes are regional specializations, all engaged in aspects of sperm motility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234171
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  • 10
    Electronic Resource
    Electronic Resource
    GLC assay of khellin in human serum and urine (1981)
    Springer
    Chromatographia 14 (1981), S. 425-427 
    Details
    ISSN: 1612-1112
    Keywords: Gas-liquid chromatography ; Khellin determination in serum and urine ; Rat experiments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A sensitive, specific and rapid GLC assay for khellin in serum and urine has been developed using flame ionization The method involves the addition of hyoscine as an internal standard, extraction with chloroform and the use of a 3% OV-17 on Gas Chromosorb column. The suitability of this procedure for serum sample analysis from rats after oral administration of the drug is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262879
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